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Full text of "The Cambridge Natural History"

MARMOSETS

ucture than they have. The Platyrrhines seem to stand at
3 base of the series. This is another example of the existence of
>haie creatures in South America.

GKOITP I.    PLATYEEHINA.
Fam. 1, Hapalidae.óWe   may   begin  the   account   of  the
.tyrrhine Monkeys with the Hapalidae or Marmosets; for this
lily is structurally lower than the rest.     They have thirty-two
&, arranged as in the following formula: If O J- Pm | Mf = 32.
j molars have three main  tubercles, and not  four as in the
tier  forms.     The digits   are  for   the  most   part   clawed, not
^ed, as in the higher types; the great toe alone bears a flat
The tail, too, is ringed, a condition which is characteristic
aiany of the lower groups of mammals, but not of the higher
&     The cerebral hemispheres are smooth, but this is a matter
ter connected with their small size than with low zoological
tion.     The tails of the Marmosets, unlike those of so many
jr American Monkeys, are   not  prehensile   though they are
The genus Jfapcde is broadly distinguished from the other
is, Midas, by the fact that the lower incisors slant forwards
in the Lemurs. They are small, soft-furred, long-tailed
ikeys, familiar to every one. There are some seven species,
sh are entirely restricted in rang© to Brazil, Bolivia, and
mbia, one species only, If. pygmaea, extending northward into
ico.
)f Tamarins, genus Midas, there are rather more speciesó
.t fourteen. They are South and Central American in dis-
ition. Since both these genera are arboreal in habit, it is
^ordinary that they have not the prehensile tails of their
rican allies. As, however, the late Mr. Bates observed an
tidual of the species M. nigricollis fall head-foremost from a
tit of at least 50 feet, alight on its feet, and run off as if
ing in particular had occurred, it is evident that 110 extra
ensile powers are absolutely necessary. Some of the Tamarins
a long mane; this is well seen in M". roscdia, or rather in
lowmus, which, if not identical with it, is at least very closely
i to it. The name is obviously derived from the character